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authorSjur Brændeland <sjur.brandeland@stericsson.com>2013-02-21 18:15:39 +0100
committerOhad Ben-Cohen <ohad@wizery.com>2013-04-07 14:06:17 +0300
commit92b38f851470f8d8ea7ed638d546f83b5268bc12 (patch)
tree2c9010584f33d5b6b9e26f6f9139e5c42b19aad0 /drivers/remoteproc/remoteproc_virtio.c
parenta2b950ac7b1e6442919ee9e79c4963e134698869 (diff)
remoteproc: support virtio config space.
Support virtio configuration space and device status. The virtio device can now access the resource table in shared memory. Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com> Acked-by: Ido Yariv <ido@wizery.com> [rebase and style changes] Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Diffstat (limited to 'drivers/remoteproc/remoteproc_virtio.c')
-rw-r--r--drivers/remoteproc/remoteproc_virtio.c79
1 files changed, 64 insertions, 15 deletions
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index afed9b7731c4..b09c75c21b60 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -173,25 +173,35 @@ error:
return ret;
}
-/*
- * We don't support yet real virtio status semantics.
- *
- * The plan is to provide this via the VDEV resource entry
- * which is part of the firmware: this way the remote processor
- * will be able to access the status values as set by us.
- */
static u8 rproc_virtio_get_status(struct virtio_device *vdev)
{
- return 0;
+ struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+ struct fw_rsc_vdev *rsc;
+
+ rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
+
+ return rsc->status;
}
static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
{
+ struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+ struct fw_rsc_vdev *rsc;
+
+ rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
+
+ rsc->status = status;
dev_dbg(&vdev->dev, "status: %d\n", status);
}
static void rproc_virtio_reset(struct virtio_device *vdev)
{
+ struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+ struct fw_rsc_vdev *rsc;
+
+ rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
+
+ rsc->status = 0;
dev_dbg(&vdev->dev, "reset !\n");
}
@@ -199,13 +209,19 @@ static void rproc_virtio_reset(struct virtio_device *vdev)
static u32 rproc_virtio_get_features(struct virtio_device *vdev)
{
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+ struct fw_rsc_vdev *rsc;
+
+ rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
- return rvdev->dfeatures;
+ return rsc->dfeatures;
}
static void rproc_virtio_finalize_features(struct virtio_device *vdev)
{
struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+ struct fw_rsc_vdev *rsc;
+
+ rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
/* Give virtio_ring a chance to accept features */
vring_transport_features(vdev);
@@ -213,13 +229,44 @@ static void rproc_virtio_finalize_features(struct virtio_device *vdev)
/*
* Remember the finalized features of our vdev, and provide it
* to the remote processor once it is powered on.
- *
- * Similarly to the status field, we don't expose yet the negotiated
- * features to the remote processors at this point. This will be
- * fixed as part of a small resource table overhaul and then an
- * extension of the virtio resource entries.
*/
- rvdev->gfeatures = vdev->features[0];
+ rsc->gfeatures = vdev->features[0];
+}
+
+static void rproc_virtio_get(struct virtio_device *vdev, unsigned offset,
+ void *buf, unsigned len)
+{
+ struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+ struct fw_rsc_vdev *rsc;
+ void *cfg;
+
+ rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
+ cfg = &rsc->vring[rsc->num_of_vrings];
+
+ if (offset + len > rsc->config_len || offset + len < len) {
+ dev_err(&vdev->dev, "rproc_virtio_get: access out of bounds\n");
+ return;
+ }
+
+ memcpy(buf, cfg + offset, len);
+}
+
+static void rproc_virtio_set(struct virtio_device *vdev, unsigned offset,
+ const void *buf, unsigned len)
+{
+ struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+ struct fw_rsc_vdev *rsc;
+ void *cfg;
+
+ rsc = (void *)rvdev->rproc->table_ptr + rvdev->rsc_offset;
+ cfg = &rsc->vring[rsc->num_of_vrings];
+
+ if (offset + len > rsc->config_len || offset + len < len) {
+ dev_err(&vdev->dev, "rproc_virtio_set: access out of bounds\n");
+ return;
+ }
+
+ memcpy(cfg + offset, buf, len);
}
static const struct virtio_config_ops rproc_virtio_config_ops = {
@@ -230,6 +277,8 @@ static const struct virtio_config_ops rproc_virtio_config_ops = {
.reset = rproc_virtio_reset,
.set_status = rproc_virtio_set_status,
.get_status = rproc_virtio_get_status,
+ .get = rproc_virtio_get,
+ .set = rproc_virtio_set,
};
/*